Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Union Gap | Populated Place | 155 | Douglas | 43 24 23 N | 123 18 50 W |
| Union High School | School | 810 | Baker | 44 52 43 N | 117 06 42 W |
| Union High School | School | 74 | Clackamas | 45 21 49 N | 122 36 57 W |
| Union High School | School | 279 | Clackamas | 45 24 00 N | 122 16 10 W |
| Union High School | School | 82 | Clatsop | 46 09 45 N | 123 37 10 W |
| Union High School | School | 119 | Lane | 44 04 07 N | 123 21 08 W |
| Union High School | School | 107 | Linn | 44 31 46 N | 122 54 52 W |
| Union High School | School | 137 | Marion | 44 48 11 N | 122 48 04 W |
| Union High School | School | 63 | Washington | 45 21 32 N | 122 50 31 W |
| Union Hill Cemetery | Cemetery | 322 | Marion | 44 53 21 N | 122 44 13 W |
| Union Hill Grange | Building | 279 | Marion | 44 52 36 N | 122 44 05 W |
| Union Junction | Locale | 828 | Union | 45 12 23 N | 117 54 36 W |
| Union Mills | Populated Place | 75 | Clackamas | 45 11 58 N | 122 33 31 W |
| Union Mills Post Office (historical) | Post Office | 75 | Clackamas | 45 11 58 N | 122 33 31 W |
| Union Mine (historical) | Mine | 1358 | Baker | 44 53 03 N | 117 20 25 W |
| Union Peak | Summit | 2315 | Klamath | 42 49 52 N | 122 13 25 W |
| Union Peak Trail | Trail | 1888 | Klamath | 42 51 21 N | 122 11 49 W |
| Union Point (historical) | Populated Place | 116 | Linn | 44 20 54 N | 122 59 08 W |
| Union Point Cemetery | Cemetery | 83 | Washington | 45 37 10 N | 123 06 13 W |
| Union Point Post Office (historical) | Post Office | 116 | Linn | 44 20 54 N | 122 59 08 W |
| Union Post Office | Post Office | 850 | Union | 45 12 30 N | 117 51 55 W |
| Union Rogue Church Camp | Locale | 869 | Jackson | 42 50 02 N | 122 29 46 W |
| Union School | School | 46 | Marion | 45 08 00 N | 122 48 26 W |
| Union Spring | Spring | 1459 | Baker | 44 58 38 N | 117 28 58 W |
| Union-Turnbow-Mays Cemetery | Cemetery | 142 | Lane | 44 12 52 N | 123 19 44 W |
| Uniontown | Populated Place | 25 | Clatsop | 46 11 09 N | 123 51 15 W |
| Uniontown Post Office (historical) | Post Office | 440 | Jackson | 42 11 54 N | 123 02 39 W |
| Unionvale | Populated Place | 52 | Yamhill | 45 08 35 N | 123 03 38 W |
| Unit Lake | Lake | 2137 | Wallowa | 45 12 12 N | 117 15 41 W |
| Unit Nine Pond | Reservoir | 1260 | Harney | 43 06 13 N | 118 51 14 W |
| Unit Reservoir | Reservoir | 1499 | Harney | 42 45 21 N | 119 27 27 W |
| United Brethren Cemetery | Cemetery | 90 | Yamhill | 45 07 27 N | 123 19 37 W |
| United Junction | Locale | 9 | Multnomah | 45 37 48 N | 122 49 21 W |
| United Junction (historical) | Locale | 13 | Multnomah | 45 36 23 N | 122 47 28 W |
| United State Fish and Wildlife River Testing Site | Locale | 46 | Wallowa | 45 54 12 N | 117 28 43 W |
| United States Bureau of Reclamation Pumping Plant E | Locale | 1248 | Klamath | 42 02 51 N | 121 47 45 W |
| United States Bureau of Reclamation Pumping Plant F | Locale | 1249 | Klamath | 42 04 42 N | 121 50 41 W |
| United States Creek | Stream | | Linn | 44 13 16 N | 122 22 48 W |
| United States Forest Service Guard Station | Locale | 630 | Morrow | 45 21 29 N | 119 33 44 W |
| United States Navy Radio Station | Locale | 5 | Clatsop | 46 09 10 N | 123 49 43 W |
| United States Navy Radio Tower Number One | Tower | 6 | Clatsop | 46 09 04 N | 123 49 42 W |
| United States Navy Radio Tower Number Three | Tower | 5 | Clatsop | 46 09 10 N | 123 49 45 W |
| United States Weather Bureau Station | Locale | 1235 | Umatilla | 45 29 39 N | 118 24 06 W |
| United Telephone System Airstrip | Airport | 58 | Hood River | 45 42 47 N | 121 31 56 W |
| Unity | Populated Place | 1223 | Baker | 44 26 15 N | 118 11 34 W |
| Unity | Populated Place | 233 | Lane | 43 56 49 N | 122 46 04 W |
| Unity Cemetery | Cemetery | 1238 | Baker | 44 27 33 N | 118 14 25 W |
| Unity Covered Bridge | Bridge | 208 | Lane | 43 56 42 N | 122 46 32 W |
| Unity Creek | Stream | | Baker | 44 37 41 N | 117 31 13 W |
| Unity Dam | Dam | 1166 | Baker | 44 30 15 N | 118 10 51 W |
| Unity Forest State Park | Park | 1357 | Baker | 44 22 17 N | 118 06 47 W |
| Unity Lake State Recreation Site | Park | 1176 | Baker | 44 29 56 N | 118 11 14 W |
| Unity Post Office | Post Office | 1223 | Baker | 44 26 15 N | 118 11 34 W |
| Unity Ranger Station | Building | 1231 | Baker | 44 26 08 N | 118 11 15 W |
| Unity Reservoir | Reservoir | 1166 | Baker | 44 30 15 N | 118 10 51 W |
| Universal Spring | Spring | 1888 | Baker | 45 03 55 N | 117 30 21 W |
| University City Park | Park | 138 | Lane | 44 02 02 N | 123 04 32 W |
| University city Park | Park | 29 | Multnomah | 45 35 13 N | 122 42 36 W |
| University Community Center | Building | 29 | Multnomah | 45 35 13 N | 122 42 37 W |
| University Falls | Falls | 488 | Tillamook | 45 35 59 N | 123 23 38 W |
| University of Oregon | School | 138 | Lane | 44 02 42 N | 123 04 32 W |
| University of Oregon Housing | School | 130 | Lane | 44 02 06 N | 123 05 04 W |
| University of Oregon Medical School Primate Center (historical) | Locale | 63 | Washington | 45 31 26 N | 122 52 29 W |
| University of Portland | School | 53 | Multnomah | 45 34 19 N | 122 43 27 W |
| University Park | Populated Place | 49 | Multnomah | 45 34 34 N | 122 43 43 W |
| University Park Post Office (historical) | Post Office | 49 | Multnomah | 45 34 34 N | 122 43 43 W |
| University Post Office | Post Office | 137 | Lane | 44 02 42 N | 123 04 28 W |
| University Post Office | Post Office | 34 | Multnomah | 45 30 49 N | 122 40 53 W |
| Updegrave Dam | Dam | 236 | Douglas | 43 17 41 N | 123 07 16 W |
| Updegrave Reservoir | Reservoir | 236 | Douglas | 43 17 41 N | 123 07 16 W |
| Uplands School | School | 134 | Clackamas | 45 25 19 N | 122 42 09 W |
| Upper Arm Recreation Site | Locale | 483 | Marion | 44 44 49 N | 122 08 34 W |
| Upper Astoria Post Office (historical) | Post Office | 4 | Clatsop | 46 11 39 N | 123 47 60 W |
| Upper Baisley-Elkhorn Mine | Mine | 2077 | Baker | 44 51 24 N | 118 04 28 W |
| Upper Bench | Ridge | 1366 | Umatilla | 45 18 00 N | 118 49 53 W |
| Upper Bend Big Antelope Creek | Bend | 1648 | Malheur | 42 17 28 N | 117 29 21 W |
| Upper Bennett Dam | Dam | 147 | Linn | 44 47 17 N | 122 44 33 W |
| Upper Bennett Spring | Spring | 898 | Jefferson | 44 33 38 N | 121 02 46 W |
| Upper Berley Lake | Lake | 1644 | Linn | 44 27 35 N | 121 53 04 W |
| Upper Bernard Creek Rapids | Rapids | 409 | Wallowa | 45 24 09 N | 116 36 49 W |
| Upper Black Bar Falls | Falls | 152 | Josephine | 42 39 07 N | 123 43 47 W |
| Upper Blaylock Canyon Spring | Spring | 1210 | Malheur | 43 35 03 N | 118 10 31 W |
| Upper Bluff Spring | Spring | 1448 | Union | 45 11 58 N | 118 33 21 W |
| Upper Bridge Creek Draw Reservoir | Reservoir | 1072 | Malheur | 43 42 59 N | 118 03 24 W |
| Upper Bronco Reservoir | Reservoir | 1351 | Grant | 44 13 15 N | 119 37 59 W |
| Upper Buck Creek Recreation Site | Locale | 1494 | Lake | 43 04 05 N | 121 14 44 W |
| Upper Buckbrush Reservoir | Reservoir | 1437 | Malheur | 44 07 55 N | 117 41 51 W |
| Upper Butler Reservoir | Reservoir | 1535 | Harney | 43 01 49 N | 119 07 58 W |
| Upper Cache Creek Rapids | Rapids | 263 | Wallowa | 45 58 54 N | 116 53 54 W |
| Upper Campbell Lake | Lake | 1361 | Lake | 42 34 50 N | 119 44 55 W |
| Upper Campground | Locale | 1442 | Deschutes | 43 53 43 N | 121 45 51 W |
| Upper Canal Reservoir | Reservoir | 1269 | Harney | 43 06 40 N | 119 06 09 W |
| Upper Cherry Creek Ranch | Locale | 825 | Jefferson | 44 39 52 N | 120 28 15 W |
| Upper Cherry Spring | Spring | 1624 | Malheur | 43 51 18 N | 117 59 16 W |
| Upper Chetco School | School | 41 | Curry | 42 04 53 N | 124 12 03 W |
| Upper Chetco Trail | Trail | 1012 | Curry | 42 15 24 N | 123 58 16 W |
| Upper Chewaucan Marsh | Flat | 1313 | Lake | 42 39 50 N | 120 28 18 W |
| Upper Chimney Creek Reservoir | Reservoir | 1518 | Malheur | 42 27 14 N | 117 33 13 W |
| Upper Chush Falls | Falls | 1704 | Deschutes | 44 08 34 N | 121 41 06 W |
| Upper City Park | Park | 62 | Yamhill | 45 17 38 N | 123 10 41 W |
| Upper Clark Reservoir | Reservoir | 1286 | Malheur | 43 09 30 N | 117 45 23 W |
| Upper Coal Riffle | Rapids | 36 | Curry | 42 30 04 N | 124 11 34 W |
| Upper Cochran Rapids | Rapids | 264 | Wallowa | 45 57 35 N | 116 53 19 W |
| Upper Cougar Camp | Locale | 1697 | Grant | 44 55 17 N | 118 41 07 W |
| Upper Cow Lake | Reservoir | 1324 | Malheur | 43 05 45 N | 117 19 54 W |
| Upper Cow Reservoir | Reservoir | 1044 | Malheur | 43 47 38 N | 117 18 33 W |
| Upper Coyote Reservoir | Reservoir | 1327 | Crook | 44 01 14 N | 119 48 12 W |
| Upper Crooked Riffle | Rapids | 28 | Curry | 42 33 34 N | 124 05 21 W |
| Upper Crossing | Locale | 1805 | Harney | 42 31 25 N | 118 47 12 W |
| Upper Crowsfoot Spring | Spring | 1779 | Harney | 43 55 10 N | 119 33 25 W |